Question: This problem uses the following procedure. This procedure uses static (lexi- cal) scoping. procedure mainO int a; procedure procl(int i) int b b a 1;

This problem uses the following procedure. This procedure uses static (lexi- cal) scoping. procedure mainO int a; procedure procl(int i) int b b a 1; procedure recursion(int k): print b; b-b 1; recursion(k b); else: a-k end recursion b b i; recursion(1); end proc1 proc1(4) print a; end main (a) What does this procedure print? (Give the output of procedure main).) (b) Rewrite the procedure main) where each variable (argument vari- ables, declared variables, procedure names) is renamed by their (level, offset) pairs. (c) How does procedure procl find variable a in instruction b-a 1;? Show the RISC instructions corresponding to the high-level instruc- tion b a 1; in this procedure. You should use the same ILOC instruction format as used in class. (d) Show the stack frames at the beginning of procedure procl. Label each frame with its procedures name, and make sure you include the local variables and their values. Show all access links and control links between the stack frames, and the frame pointer (FP), by drawing arrows. You should use the frame layout in the figure below Parameters Return value Return address Access link Caller FP Local variables Frame Pointer (FP) Figure 1: Figure for the frame layout This problem uses the following procedure. This procedure uses static (lexi- cal) scoping. procedure mainO int a; procedure procl(int i) int b b a 1; procedure recursion(int k): print b; b-b 1; recursion(k b); else: a-k end recursion b b i; recursion(1); end proc1 proc1(4) print a; end main (a) What does this procedure print? (Give the output of procedure main).) (b) Rewrite the procedure main) where each variable (argument vari- ables, declared variables, procedure names) is renamed by their (level, offset) pairs. (c) How does procedure procl find variable a in instruction b-a 1;? Show the RISC instructions corresponding to the high-level instruc- tion b a 1; in this procedure. You should use the same ILOC instruction format as used in class. (d) Show the stack frames at the beginning of procedure procl. Label each frame with its procedures name, and make sure you include the local variables and their values. Show all access links and control links between the stack frames, and the frame pointer (FP), by drawing arrows. You should use the frame layout in the figure below Parameters Return value Return address Access link Caller FP Local variables Frame Pointer (FP) Figure 1: Figure for the frame layout
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